More uphill speed required!

[EyeSee]

I have had my Baotian BT50QT-9 for two weeks and it is approaching its first oil change at 300KM.

I have read through a lot of the posts on this forum and have a pretty good idea of what can be done to improve performance. However, my problem is slightly different due to where I live, that is on the Greek island of Kalymnos where the roads are quite often in poor condition and, more importantly, are nearly all on an incline and many are very steep and twisty. So, I am not interested in de-restricting to exceed 30MPH/48KPH, I just want to get up hills quicker!

I know it is early days and a few more KMs and oil changes will help boost performance, but I don’t think it will improve it enough. At present, on the steepest of hills any momentum gained on the approach is soon lost and I end up crawling at not much more than 10KMH. I tried yesterday with my wife on the back and …….. she had to get off and walk on the steepest incline to get home!

My problem is similar to that esaycee has in High Wycombe, see ‘Slow Moving BT50QT-9’ on Page 2 of ‘Engine & Derestriction’. Apart from one reply from Hypojam, this post stopped dead. esaycee – If your reading, how are things now? I know your hills as my brother lived in Hazelmere and now lives in Wooburn Green. Amersham to Beaconsfield must be fun?!!

OK, so what are my options?

Rollers or contra spring (in rear variator) – change one, both or something else (… the scooter perhaps!)?

If it is the rollers, what weight would anyone suggest, as speeds over 30MPH/48KPH are not an issue? Also, what weight are the factory ones I already have fitted? I have read that some say 6g, but some have been fitted with 8g. What make/model was this in? When I read that some people are satisfied with 6g, it makes me think I have 8g! What difference would changing the drive face boss to 36mm make?

Contra spring – I have read Hypojam’s ‘Clutch Springs?’ on Page 2 of ‘Engine & Derestriction’. I too have noticed that the engine revs fail to drop back down, but when at a standstill and after the clutch has disengaged. I have also read the article at:
www.teamcalamari.com/zuma/variator.html

If I change the rollers, does anyone know of any UK suppliers that do cheap international delivery as I have made some enquiries locally and the lowest stocked weight was 5.5g. I know Scooter Assassins do weights for £4.50 + £1.50 P&P to anywhere in the world. Are these rollers any good?

Suggestions anyone?

Regards,

Eye See

[ally1756]

if u derestrict then u will get more power which in theory should help you to get up the hill, but new rollers preferably 4.7g rollers would give u higher revs

ally

[hypojam]

Firstly make sure you derestrict the bike, change spark plug, adjust valve clearances then...

Buy a set of 4g rollers from assassins, and mix three original rollers with three 4g rollers.
Or you could try a complete 4g roller setup.

Both of those roller setups let the bike rev higher and therefore produce more hill climbing power.

The assassins roller quality isn't amazing but there good for testing purposes, you will get roughly about 500 miles use before they become totally useless i thinks....

Hope This Helps

[Macrofeet]

i'd think about getting the 80cc kit fitted if you are wanting to carry pillion

The power on the 50cc scoots is low compaired with other scoots not really good for 2 up big hills

[hypojam]

My bike quite easily manages 35mph with a pillion, but mine is probably already 80cc

[ally1756]

what do u mean probably?
ally

[BillyGreen1973]

As Hypo says, do the derestriction, change the rollers, and you would probably benefit from a stronger contra spring.

The bike needs to be set up correctly in the first place, fuel mixture, valve clearences, etc.


I also have the BT50QT-9, mine came with 6.5g rollers, although I have heard of some coming with 8g or even a mix of a few differnt rollers!!! The 4.5g to 5g rollers should be fine for you.

[hypojam]

ally1756 said:

what do u mean probably?
ally

My cylinder and piston look identical, to other 80cc engines, but its meant to be 50cc

[ally1756]

ah ok kool
do u get the pwoer of an 80cc?
ally

[hypojam]

ally1756 said:

ah ok kool
do u get the pwoer of an 80cc?
ally

Top speed 45, haven't been beaten by any other 50cc scooter Ive met

So i guess you could call that 80cc power

[ally1756]

isnt 45 a pretty standard top speed for a 50cc? u must have some more acceleration?
ally

[baotian]

45 isent that fast compared tos some deristricted 2 strokes, 1 of my freinds has a normal peguot vavicity, and his doese 50 and aclels alot better.
but still good speed, as mine only realy doese 40 on a flat (on a good day ) lol

[Macrofeet]

125cc = 55 - 80
90cc = 50 -55
80cc = 40 - 50
50cc = 30 = 40


biotains are quite low powerd not ment as an insult or anything but if you look at the specs this is true

[hypojam]

Small 4-stroke engines supposedly have half the power of similar sized 2-stroke's

And I'm pretty sure the gearing is too short on our ped's

[hypojam]

macrofeet said:

125cc = 55 - 80
90cc = 50 -55
80cc = 40 - 50
50cc = 30 = 40

Things like NRG's which are 50cc are capable of stupidly fast speeds of like 60-70mph

[Macrofeet]

one of the aprilia scooters is ment to do 95mph but i think the list i wrote is correct for the majority